11780649 has 12 divisors (see below), whose sum is σ = 17046900. Its totient is φ = 7839744.

The previous prime is 11780617. The next prime is 11780687. The reversal of 11780649 is 94608711.

11780649 is a `hidden beast` number, since 1 + 1 + 7 + 8 + 0 + 649 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 11594025 = 432^2 + 3405^2 .

It is not a de Polignac number, because 11780649 - 2⁵ = 11780617 is a prime.

It is a super-2 number, since 2×11780649² = 277567381722402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11780149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7657 + ... + 9065.

It is an arithmetic number, because the mean of its divisors is an integer number (1420575).

Almost surely, 2^11780649 is an apocalyptic number.

It is an amenable number.

11780649 is a deficient number, since it is larger than the sum of its proper divisors (5266251).

11780649 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (11780648) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (2341).

11780649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2341 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 11780649 is about 3432.2950048036. The cubic root of 11780649 is about 227.5392936194.

It can be divided in two parts, 117806 and 49, that added together give a triangular number (117855 = T₄₈₅).

The spelling of 11780649 in words is "eleven million, seven hundred eighty thousand, six hundred forty-nine".